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Help asb configure my Growatt 5000TL HVM P + 4.8kw 100AH LiFEPO4 battery.


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I have 12 x 370W panels split into 4 strings (3 panels per string) Supplying ~120V and 3700W peak to my inverter. 

My desired scenario is to carry all loads on the panels during clear sky daytime. 

Today was such a day, but as soon as I introduce a total load of over 1000W (pool + appliances), Solar Usage drastically drops and power is thus provided from the battery & panels <- undesired.

 

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I believe my panels have sufficient power to carry all loads, but sadly the inverter does not allow it. 

The battery manual recommends configuring these settings if not connected via BMS, which I am not. 

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My current Settings are as follows - and have played with the SBU setting, but still no joy.. 

1. SOL

2. 50A

5. USE

11. 30A

12. 47.7V

13. 51.5V

14. OSO

19. 55V

20. 55V

21. 44V

22. SBd

Any assistance will be appreciated.

 

 

 

 

 

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2 hours ago, PickleRick said:

I have 12 x 370W panels split into 4 strings (3 panels per string) Supplying ~120V and 3700W peak to my inverter. 

My desired scenario is to carry all loads on the panels during clear sky daytime. 

Today was such a day, but as soon as I introduce a total load of over 1000W (pool + appliances), Solar Usage drastically drops and power is thus provided from the battery & panels <- undesired.

 

spacer.png

I believe my panels have sufficient power to carry all loads, but sadly the inverter does not allow it. 

The battery manual recommends configuring these settings if not connected via BMS, which I am not. 

spacer.png

My current Settings are as follows - and have played with the SBU setting, but still no joy.. 

1. SOL

2. 50A

5. USE

11. 30A

12. 47.7V

13. 51.5V

14. OSO

19. 55V

20. 55V

21. 44V

22. SBd

Any assistance will be appreciated.

 

 

 

 

 

Hi, your string voltage is higher than what it should be. Max is 115Vdc, so you need to connect your PV panels in two series, six parallel strings. Check Page 11 of the installation manual. Start there and see how it goes  

PV Max Vdc.PNG

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  • 3 weeks later...

Hi Thanks hoohloc.

I changed my setup to 2P2S with an average voltage of 80V to the inverter.

Sadly, my problem still persists.

0?ui=2&ik=8b1c02b6b2&attid=0.1.1&permmsgid=msg-f:1691429567287962043&th=17792a3ad8caa9bb&view=fimg&sz=s0-l75-ft&attbid=ANGjdJ9zJ1AIpAI-JPbDeLyS8xxEU-6EsHe7F0_EQnNYPOND-5jbFY9lbW1SCa3_3-7rXthBTgwKUvfytNQNX48pCQO7I69-UV-j4CwUJYJGBF-eZBnGZ3BpiON4sVg&disp=emb

As soon as the battery is full, the inverter would rather drain from the battery or use eskom, when I have a full "Sun Day".

image.thumb.png.e3ed413e8a0fa118c6cdaf2bc288616c.png

 

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  • 1 month later...

Assume Solar Module 1S

Voc = 48.2V Vmp = 39.6V Imp 9.35A

Solar Array 6P2S

x6 Strings in parallel   Vmp = 79.2     Imp = 56.1A

Solar Wire Sizing Recommended

Assume 40 meter between combiner box and Inverter

Wire size of 16mm2 is Required for <3% Volt drop @ Imp 56.1

 Wire size of 10mm2  is Required for <3% Volt drop @ Imp 45A


Recommendation would be to check if a  16mm2 solar cables (Or x3 6mm2 per phase) are installed. 

If the solar cable is not 16mm2  (Or x3 6mm2 per phase) then the solar array cannot supply the max. required power to the inverter when the load is increased, due to power losses within the cables

 

For additional info Refer to inverter manual page 9

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7 minutes ago, Alex Feldmann said:

Assume Solar Module 1S

Voc = 48.2V Vmp = 39.6V Imp 9.35A

Solar Array 6P2S

x6 Strings in parallel   Vmp = 79.2     Imp = 56.1A

Solar Wire Sizing Recommended

Assume 40 meter between combiner box and Inverter

Wire size of 16mm2 is Required for <3% Volt drop @ Imp 56.1

 Wire size of 10mm2  is Required for <3% Volt drop @ Imp 45A


Recommendation would be to check if a  16mm2 solar cables (Or x3 6mm2 per phase) are installed. 

If the solar cable is not 16mm2  (Or x3 6mm2 per phase) then the solar array cannot supply the max. required power to the inverter when the load is increased, due to power losses within the cables

 

For additional info Refer to inverter manual page 9

Change <3%  to <10%

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  • 3 weeks later...
Posted (edited)

Thanks.

I have 2 strings coming from the panels to the fuses.

From the fuses, I'm then combining them to 1 string to the Inverter.

Cables from Panels are 6mm - Cables from Fuses to Inverter are 16mm2.

I cant feel any hot wires when solar input is maximum, but they are sightly on the warm side.

Appreciate all the help thus far.

With some tinkering and a bit more battery storage, I've managed to get to a more comfortable place. I'm nowhere near the 4200W of installed panels, But I'll take what I'm currently getting. No eskom used at all on most days.

image.thumb.png.4a611d306bb7c69d93ba637c11a271b4.png

 

 

Edited by PickleRick
Updated
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